#include<iostream>
using namespace std;
typedef long long ll;
const int N = 1e4 + 10;
int b[N];

int main()
{
    cin.tie(0), cout.tie(0), ios::sync_with_stdio(false);
    int n;
    cin >> n;
    int w = 1, i = 1;
    while(i < n)
    {
        if(b[i])
        {
            cout << -1;
            return 0;
        }
        int u = i, ans = 0;
        while(u)
        {
            if(u & 1) ans ++ ;
            u >>= 1;
        }
        b[i] = 1;
        if(i + ans <= n) i += ans;
        else i -= ans;
        w ++ ;
    }
    // 1 2 3 5 7 10 12

    if(i != n) cout << -1;
    else cout << w;

    return 0;
}